Rezzing this thread to say nothing ventured, nothing gained.
Also, you will need to log out to do the Username Search. Like all Dating Websites, the paywall targets (desparate) guys. Once you find someone you want to message, copy the profile URL, log in again and paste the profile in the address box. It's a crude workaround but it works.
Like CraigsList, it won't cost you anything to send and receive messages. Speaking of CL, it varies by area. Some areas, you have an easier time finding someone than others.
If this thread could be renamed to "Meeting Pregnant Woman on POF & Craigslist" that would be great.